Furnace regulator



Patented May 4, 1926.

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FUnnAc-n meet-Aron Applihatibh filed February 1 1, i922. sriai m. 536,46i);

'To all whom it mag concern: I

Be it known that I, FRANK M. GARMAN, a

citizen of the United States, residing, at

Alma Center, in the county of Jackson and State of vV7isconsiri,;l1ave invented a new and useful Furnace Regulator, of which the following is a specification. I

This invention has referenceto. stoves and furnaces, and more particularly to the damper construction thereof. II I I The primary object of the inventionis to provide means for. au'toma'tically controlling thedampers of the stove or. furnace to insure'an even heat. I I II Another object of the invention is to prvide a damper op'eratingmeans controlled by the expansion and construction of the furnace wall, the operating means including an electrically controlled motor.

With the foregoing and other objectsin view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, itbeing understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

Referring to the drawing: I The figure illustrates an elevational view of a furnace disclosing a controlling device constructed in accordance with the present invention, as applied.

Referring to the drawing in detaiLthe reference character 5 designates a furnace which may be of any desired construction,

the same being provided with a door 6 hinged from the upper edge thereof, the door being provided to control the passage of air to the firebox of the furnace.

A damper 7 is in the pipe 8 and controls the passage of air through the pipe to increase ordecrease the draught throughthe furnace.

' A supporting bar 9 is secured to the" carries a switch element l6on the outer I end thereof. Pivotally connected to the bar is avertical rod 17 which has, its lower end extended througha suitable openingin the furnace casing,- where the rod contacts with the 'furnaceprQper lS, therod 17 being sensitive to mo vements of the furnace walll due to expansion and contraction of the, furnace wall. I I,

A flexible member 19 connects the I door 6 an d damper], the flexible member being he na ma ng. ve ;the pul ys 1 s that when the damper 7 is open; thedoor isclose 1? i er a Ass ated wit the flexible member 19, isan. electricf motor 90 ,i i ha an M 121 tha is onnec I w th :.fiQ b19f. li lbe i 193s) th t-Mu n the arm 21 is moved, the flexible member 19 is also moved to accomplish the purpose of the invention. I 1 vSwitch members 22 are associated with the switch element 16, whereby the circuit to the motor 20 will be completed, when the switch element 16 contacts with one of the switch members 22.

1 1 is pivotally connected to the bracket 13 at 13, In order that the point of connec- The arms 14 and" 15 are pivotally connected at' 23 and the arm.

tion between the arms 14: and 15, may be moved with' respect to the'rod 17 a chain 24: is provided which has connection with the outer end of the arm lt, and passes over the drum 25.. Thus it will be seen that upon moving the drum 25 to windthe chain 24 thereon, the point of connection 23 may be moved to causethe switch members to be I operated under comparatively low degree of temperature. A weight indicated at 15 is secured to the arm 15 ata point adjacent to the outer-end thereof, so that as the wall 18 moves downwardly, the weight together with the weight of the rod 17 i will cause the arm 15 to move downwardly. I

The device is shown in the drawing as I in its neutral or inactive position. 7

Assuming that the temperature in the furnace rises, the expansion of the furnace wall 18 will move the rod 17 upwardlycausing the switch element at theouter end of the arm 15 to engage the uppermost switch member 22 and contact 22 with the result that the circuit to the motor is completed to cause the motor to operate in one direc- 7 tion or in a manner to cause the arm 22't0: thedamper .7 tomove downwardly opening cool the furnace. J I I 1 When the furnace. cools, it is obvious that the rod 17 will drop causing the arm 15 to be moved and complete 7 a circuit to the motor by its contact with the lowermost switch element 22, and contact 22 wlth the result that a m 21 is moved upwardly open ing the door 6 and closing the damper 7.

By an operation of the drum 25, the arm 14 may be moved with respect to the rod 17 and arm 15 to cause the arm 15 to operate at predetermined temperatures. I

TVhen the furnace becomes heated and the wall 18 moves upwardly under the heat of the furnace, the outer end of arm 15 will move downwardly to engage the contact member 22 completing the circuit to the motor which circuit supplies electric energy to the motor in a manner to cause the motor to operate-in the opposite direction to the end that the door 6 will bev moved to its closed position and the damper 7 opened to cool the furnace.

Having thus described the invention, what is claimed as new is A draft regulating device for a furnace having a damper and a hinged ash pit door,

including a supporting bar, a bracket depending from the supporting bar, an arm having pivotal connection with the bracket at a point adjacent to one end of the arm, a bar carrying a switch element at its free end, pivotally connected to the arm at a point adjacent to the bracket, a rod connected with the bar at a point adjacent to its connection with the arm, said rod hav ing its free end resting on the furnace wall, a motor having an arm, a flexible member connecting the motor arm, damper and ash pit door, contact members in circuit with the motor to cause the motor to move in opposite directions, to move the motor arm and damper and ashpit door, and'sald bar adapted to move to bring the switch element carried thereby into engagement with the contact members to control the movements of the motor. 7 7

In testimony that I claimthe foregoing as my own, I have hereto afiixed my signature.

FRANK M. GARMAN. 

